Stape x Shopify - purchase_stape value missing

Hi guys

I have integrated a store with with the Stape Server GTM and it looks like everything is working and I get the correct values in the dataLayer.

GA4 is reporting all events, but purchase_stape does not have any value. It just shows 0 value on 3 conversions yesterday. What could cause this? Anything I can debug og fix?

I can see the revenue is coming in as Strings instead of Integers. Is that a bug in the Stape Server GTM app or how can I change/modify this?